And Kylie received her endorsement in person; At the bash, Christina, sporting flashy party sunglasses, a multi-colored fur coat and a large pink, curly wig similar to one she wore on The Voice, and the reality star cuddled up for a kiss.

"Happy Birthday @xtina !!!!!!" she wrote on Instagram, alongside a video of the two.

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The party was held at Christina's house and lasted until about 1:30 a.m.

The bash had "Chaps and Tutus" theme and many sweet treats were served. Candy stations were placed around the room and the party also contained a piñata.

Christina received a three-tier cake with pastel pink, yellow and purple icing, decorated with doughnuts, multi-colored swirled lollipops, gumdrops and an upside down ice cream cone for a topper.

Also, keeping up with the holiday spirit, red Christmas trees adorned the room.

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Christina was joined at the party by her fiancé, Matthew Rutler.

Other guests included Melissa McCarthy, who had a blast on the dance floor, The Voice alum and Curly Sue star Alisan Porter and singer and Real Housewives of Beverly Hills star Erika Jayne, who performed on the dance floor and also cuddled up to Christina, on a lavish loveseat.

The birthday girl had by that point ditched the coat, but kept the wig, and sported a black and leopard-print dress.